Incidence and molecular characterization of potato leaf roll virus in seed potato production in Serbia

2021 ◽  
Author(s):  
Danijela Ristić ◽  
Ivan Vučurović ◽  
Ana Vučurović ◽  
Svetlana Živković ◽  
Katarina Gašić ◽  
...  
Keyword(s):  
Molecular Characterization ◽  
Seed Potato ◽  
Leaf Roll ◽  
Potato Production ◽  
Potato Leaf Roll Virus ◽  
Potato Leaf ◽  
Seed Potato Production

scholarly journals Lack of relationship between aphid virus vector activity and potato leaf roll virus incidence

2001 ◽  
Vol 54 ◽  
pp. 229-234 ◽  
Author(s):  
D.A.J. Teulon ◽  
M.A.W. Stufkens
Keyword(s):  
Seed Potato ◽  
Leaf Roll ◽  
Correlation Coefficients ◽  
Virus Vector ◽  
Potato Leaf Roll Virus ◽  
Potato Leaf ◽  
Virus Incidence ◽  
Vector Activity ◽  
Seed Crops ◽  
Potato Crops

The relationship between activity of aphid virus vectors and incidence of potato leaf roll virus (PLRV) in seed potato crops was investigated using historical data Numbers of PRLV aphid vectors (mainly green peach aphids) caught in a 75 m suction trap at Lincoln Canterbury and the incidence of primary and secondary PLRV for Ilam Hardy seed crops from the PT seed potato certification scheme in Canterbury were collated from 1982 to 2000 The degree of simple linear relatedness between aphid flight activity and virus incidence was examined Climate variables which may have contributed to aphid survival reproduction and movement in potato crops were also investigated Very low correlation coefficients between all variables tested were obtained Explanations for the lack of any relationship between potato aphid virus vector flights and virus incidence in potatoes are discussed

Technical Efficiency in Seed Potato Production Systems in Uganda

2018 ◽  
Vol 10 (3(J)) ◽  
pp. 122-140
Author(s):  
Ambrose Rwaheru Aheisibwe ◽  
Razack B. Lokina ◽  
Aloyce S. Hepelwa
Keyword(s):  
Technical Efficiency ◽  
Seed Potato ◽  
Arable Land ◽  
Stochastic Frontier ◽  
Potato Production ◽  
Maximum Likelihood Estimates ◽  
Farm Income ◽  
Seed Potato Production ◽  
Extension Services ◽  
Income Source

This study established the level of technical efficiency and its determinants among the informal and formal seed potato producers in the southwestern highlands agro - ecological zone of Uganda. A multi- stage sampling procedure was employed to select 636 households (499 informal seed producers and 137 formal seed producers) from which data was collected for two seasons using a semi - structured questionnaire. Data was analyzed using the stochastic frontier approach with a one - step approach. Maximum likelihood estimates for the efficiency parameters showed that both informal and formal seed potato producers were not fully efficient. The mean technical efficiency for informal and formal seed potato producers was 8 1 .4 and 80.4 percent respectively. In terms of yield loss, informal and formal seed potato producers respectively lost an average of 981 and 1,208 kg/acre of seed potato tubers due to inefficiency factors . Specifically, off- farm income source, scale of production, seasonal variation, access to extension services and seed producer being male positively influenced informal seed producers’ technical efficiency while producers’ level of education and seed potato variety diversity negatively influenced their efficiency. For formal seed producers, technical efficiency was influenced positively by producers’ education and negatively by household size. The study suggests that there is an opportunity to improve technical efficiency of informal and formal seed producers by 19 and 20 percent respectively. Therefore, this calls for increased investment in developing and promoting high yielding varieties, provision of extension services, input intensification and addressing gender issues in seed potato production in the context of limited arable land .

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